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                                <h1 id="&#x7D22;&#x5F15;&#x5931;&#x6548;">&#x7D22;&#x5F15;&#x5931;&#x6548;</h1>
<h4 id="1&#x8303;&#x56F4;&#x67E5;&#x8BE2;&#x5927;&#x4E8E;&#x5168;&#x8868;-30&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4;&#x7D22;&#x5F15;&#x5931;&#x6548;&#x8F6C;&#x800C;&#x8D70;&#x5168;&#x8868;&#xFF1B;">1.&#x8303;&#x56F4;&#x67E5;&#x8BE2;&#x5927;&#x4E8E;&#x5168;&#x8868; 30%&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4;&#x7D22;&#x5F15;&#x5931;&#x6548;&#x8F6C;&#x800C;&#x8D70;&#x5168;&#x8868;&#xFF1B;</h4>
<h4 id="2&#x6700;&#x4F73;&#x5DE6;&#x524D;&#x7F00;&#x6CD5;&#x5219;">2.&#x6700;&#x4F73;&#x5DE6;&#x524D;&#x7F00;&#x6CD5;&#x5219;</h4>
<ul>
<li>&#x5982;&#x679C;&#x7D22;&#x5F15;&#x662F;&#x8054;&#x5408;&#x7D22;&#x5F15;&#xFF0C;&#x8981;&#x9075;&#x5B88;&#x6B64;&#x89C4;&#x5219;&#xFF0C;&#x6307;&#x7684;&#x662F;&#x4ECE;&#x7D22;&#x5F15;&#x6700;&#x5DE6;&#x524D;&#x5217;&#x5F00;&#x59CB;&#x5E76;&#x4E14;&#x4E0D;&#x8DF3;&#x8FC7;&#x7D22;&#x5F15;&#x4E2D;&#x7684;&#x5217;</li>
<li>&#x5728;&#x5339;&#x914D;&#x5230; &#x8303;&#x56F4;&#x67E5;&#x8BE2;&#xFF0C;&lt;&gt;, &#x4E0D;&#x7B49;&#x4E8E;&#x67E5;&#x8BE2;&#x540E;&#x4F1A;&#x5BFC;&#x81F4;&#x540E;&#x9762;&#x7684;&#x5B57;&#x6BB5;&#x65E0;&#x6CD5;&#x8D70;&#x7D22;&#x5F15;</li>
</ul>
<pre><code>mysql&gt; mysql&gt; explain select * from staffs where age=23 and pos=&apos;dev&apos;;
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | NULL          | NULL | NULL    | NULL |    3 |    33.33 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.01 sec)
</code></pre><h4 id="3&#x4E0D;&#x5728;&#x7D22;&#x5F15;&#x5217;&#x4E0A;&#x505A;&#x4EFB;&#x4F55;&#x64CD;&#x4F5C;">3.&#x4E0D;&#x5728;&#x7D22;&#x5F15;&#x5217;&#x4E0A;&#x505A;&#x4EFB;&#x4F55;&#x64CD;&#x4F5C;</h4>
<ul>
<li>&#x8BA1;&#x7B97;&#x3001;&#x51FD;&#x6570;&#x3001;&#xFF08;&#x81EA;&#x52A8;&#x6216;&#x624B;&#x52A8;&#xFF09;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#xFF0C;&#x4F1A;&#x5BFC;&#x81F4;&#x7D22;&#x5F15;&#x5931;&#x6548;&#x800C;&#x8F6C;&#x5411;&#x5168;&#x8868;&#x626B;&#x63CF;</li>
</ul>
<pre><code>mysql&gt; explain select * from staffs where name= &apos;July&apos;;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref   | rows | filtered | Extra |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 74      | const |    1 |   100.00 | NULL  |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
1 row in set, 1 warning (0.00 sec)

mysql&gt; explain select * from staffs where left(name,4)= &apos;July&apos;;
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | NULL          | NULL | NULL    | NULL |    3 |   100.00 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="4&#x5B58;&#x50A8;&#x5F15;&#x64CE;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x7D22;&#x5F15;&#x4E2D;&#x8303;&#x56F4;&#x6761;&#x4EF6;&#x53F3;&#x8FB9;&#x7684;&#x5217;">4.&#x5B58;&#x50A8;&#x5F15;&#x64CE;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x7D22;&#x5F15;&#x4E2D;&#x8303;&#x56F4;&#x6761;&#x4EF6;&#x53F3;&#x8FB9;&#x7684;&#x5217;</h4>
<ul>
<li>&#x8303;&#x56F4;&#x4E4B;&#x540E;&#x5168;&#x5931;&#x6548;</li>
</ul>
<pre><code>mysql&gt; explain select * from staffs where name=&apos;July&apos; and age =22;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------+------+----------+-------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref         | rows | filtered | Extra |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------+------+----------+-------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 78      | const,const |    1 |   100.00 | NULL  |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------+------+----------+-------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select * from staffs where name=&apos;July&apos; and age =22 and pos=&apos;manager&apos;;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref               | rows | filtered | Extra |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 140     | const,const,const |    1 |   100.00 | NULL  |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="5&#x5C3D;&#x91CF;&#x4F7F;&#x7528;&#x8986;&#x76D6;&#x7D22;&#x5F15;&#xFF08;&#x53EA;&#x8BBF;&#x95EE;&#x7D22;&#x5F15;&#x7684;&#x67E5;&#x8BE2;&#xFF08;&#x7D22;&#x5F15;&#x5217;&#x548C;&#x67E5;&#x8BE2;&#x5217;&#x4E00;&#x76F4;&#xFF09;&#xFF09;&#xFF0C;&#x51CF;&#x5C11;select-">5.&#x5C3D;&#x91CF;&#x4F7F;&#x7528;&#x8986;&#x76D6;&#x7D22;&#x5F15;&#xFF08;&#x53EA;&#x8BBF;&#x95EE;&#x7D22;&#x5F15;&#x7684;&#x67E5;&#x8BE2;&#xFF08;&#x7D22;&#x5F15;&#x5217;&#x548C;&#x67E5;&#x8BE2;&#x5217;&#x4E00;&#x76F4;&#xFF09;&#xFF09;&#xFF0C;&#x51CF;&#x5C11;select *</h4>
<pre><code>mysql&gt; explain select * from staffs where name=&apos;July&apos; and age=25 and pos=&apos;manager&apos;;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref               | rows | filtered | Extra |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 140     | const,const,const |    1 |   100.00 | NULL  |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select name, age, pos from staffs where name=&apos;July&apos; and age=25 and pos=&apos;manager&apos;;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref               | rows | filtered | Extra       |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 140     | const,const,const |    1 |   100.00 | Using index |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------------------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="6mysql&#x5728;&#x4F7F;&#x7528;&#x4E0D;&#x7B49;&#x4E8E;&#xFF08;&#xFF01;&#x6216;&#xFF09;&#x65F6;&#x5019;&#xFF0C;&#x65E0;&#x6CD5;&#x4F7F;&#x7528;&#x7D22;&#x5F15;&#x5BFC;&#x81F4;&#x5168;&#x8868;&#x626B;&#x63CF;">6.mysql&#x5728;&#x4F7F;&#x7528;&#x4E0D;&#x7B49;&#x4E8E;&#xFF08;&#xFF01;=&#x6216;&lt;&gt;&#xFF09;&#x65F6;&#x5019;&#xFF0C;&#x65E0;&#x6CD5;&#x4F7F;&#x7528;&#x7D22;&#x5F15;&#x5BFC;&#x81F4;&#x5168;&#x8868;&#x626B;&#x63CF;</h4>
<pre><code>mysql&gt; explain select * from staffs where name=&apos;July&apos;;
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
| id | select_type | table  | partitions | type | possible_keys         | key                   | key_len | ref   | rows | filtered | Extra |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
|  1 | SIMPLE      | staffs | NULL       | ref  | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 74      | const |    1 |   100.00 | NULL  |
+----+-------------+--------+------------+------+-----------------------+-----------------------+---------+-------+------+----------+-------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select * from staffs where name!=&apos;July&apos;;
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys         | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | idx_staffs_nameAgePos | NULL | NULL    | NULL |    3 |    66.67 | Using where |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)

mysql&gt; explain select * from staffs where name &lt;&gt; &apos;July&apos;;
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys         | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | idx_staffs_nameAgePos | NULL | NULL    | NULL |    3 |    66.67 | Using where |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="7is-null&#xFF0C;is-not-null&#x4E5F;&#x65E0;&#x6CD5;&#x4F7F;&#x7528;&#x7D22;&#x5F15;"><a href="http://7.is/" target="_blank">7.is</a> null&#xFF0C;is not null&#x4E5F;&#x65E0;&#x6CD5;&#x4F7F;&#x7528;&#x7D22;&#x5F15;</h4>
<pre><code>mysql&gt; explain select * from staffs where name is null;
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+------------------+
| id | select_type | table | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra            |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+------------------+
|  1 | SIMPLE      | NULL  | NULL       | NULL | NULL          | NULL | NULL    | NULL | NULL |     NULL | Impossible WHERE |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+------------------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select * from staffs where name is not null;
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys         | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | idx_staffs_nameAgePos | NULL | NULL    | NULL |    3 |    66.67 | Using where |
+----+-------------+--------+------------+------+-----------------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="8like&#x4EE5;&#x901A;&#x914D;&#x7B26;&#x5F00;&#x5934;&#xFF0C;mysql&#x7D22;&#x5F15;&#x5931;&#x6548;&#x4F1A;&#x7F16;&#x7A0B;&#x5168;&#x8868;&#x626B;&#x63CF;&#x7684;&#x64CD;&#x4F5C;">8.like&#x4EE5;&#x901A;&#x914D;&#x7B26;&#x5F00;&#x5934;&#xFF0C;mysql&#x7D22;&#x5F15;&#x5931;&#x6548;&#x4F1A;&#x7F16;&#x7A0B;&#x5168;&#x8868;&#x626B;&#x63CF;&#x7684;&#x64CD;&#x4F5C;</h4>
<ul>
<li>&#x767E;&#x5206;like&#x52A0;&#x53F3;&#x8FB9;</li>
</ul>
<pre><code>mysql&gt; explain select * from staffs where name like &apos;%July%&apos;;
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | NULL          | NULL | NULL    | NULL |    3 |    33.33 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select * from staffs where name like &apos;%July&apos;;
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table  | partitions | type | possible_keys | key  | key_len | ref  | rows | filtered | Extra       |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
|  1 | SIMPLE      | staffs | NULL       | ALL  | NULL          | NULL | NULL    | NULL |    3 |    33.33 | Using where |
+----+-------------+--------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql&gt; explain select * from staffs where name like &apos;July%&apos;;
+----+-------------+--------+------------+-------+-----------------------+-----------------------+---------+------+------+----------+-----------------------+
| id | select_type | table  | partitions | type  | possible_keys         | key                   | key_len | ref  | rows | filtered | Extra                 |
+----+-------------+--------+------------+-------+-----------------------+-----------------------+---------+------+------+----------+-----------------------+
|  1 | SIMPLE      | staffs | NULL       | range | idx_staffs_nameAgePos | idx_staffs_nameAgePos | 74      | NULL |    1 |   100.00 | Using index condition |
+----+-------------+--------+------------+-------+-----------------------+-----------------------+---------+------+------+----------+-----------------------+
1 row in set, 1 warning (0.00 sec)
</code></pre><h4 id="9&#x5B57;&#x7B26;&#x4E32;&#x4E0D;&#x52A0;&#x5355;&#x5F15;&#x53F7;&#xFF0C;&#x7D22;&#x5F15;&#x5931;&#x6548;">9.&#x5B57;&#x7B26;&#x4E32;&#x4E0D;&#x52A0;&#x5355;&#x5F15;&#x53F7;&#xFF0C;&#x7D22;&#x5F15;&#x5931;&#x6548;</h4>
<ul>
<li>&#x907F;&#x514D;&#x9690;&#x5F0F;&#x7C7B;&#x578B;&#x8F6C;&#x6362;</li>
</ul>
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<h4 id="11-&#x591A;&#x5B57;&#x6BB5;&#x552F;&#x4E00;&#x7D22;&#x5F15;&#xFF0C;&#x7531;&#x4E8E;&#x9ED8;&#x8BA4;&#x503C;&#x662F;null&#x7684;&#x7F18;&#x6545;&#xFF0C;&#x5BFC;&#x81F4;&#x552F;&#x4E00;&#x7D22;&#x5F15;&#x5931;&#x6548;">11. &#x591A;&#x5B57;&#x6BB5;&#x552F;&#x4E00;&#x7D22;&#x5F15;&#xFF0C;&#x7531;&#x4E8E;&#x9ED8;&#x8BA4;&#x503C;&#x662F;null&#x7684;&#x7F18;&#x6545;&#xFF0C;&#x5BFC;&#x81F4;&#x552F;&#x4E00;&#x7D22;&#x5F15;&#x5931;&#x6548;</h4>

                                
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